Sash-operating device.



C. A. PERKINS.

SASH OPERATING DEVICE.

APPLICATION FILED APR. 27, 1911.

Patented Aug. 19, 1913.

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CHESTER A. PERKINS, 0E sou'rii BEND, inDIANA.

SASH-OPERATIN'G DEVICE.

Specification of Letters Patent.

Patented Au 19,1913.

Application filed April a, iiii. Serial its. a m.

To all whom it may concern:

Be it known that I, CHESTER A. PERKINS, a citizen of the United States, residing at South Bend, in the county of St. Joseph and State of Indiana, have invented certain new and useful Improvements in Sash-Operating Devices, of which the following is a specification.

My invention relates to improvements in sash operating devices, and has for its object the provision of means whereby a large number of sash may be conveniently and easily opened or closed in unison.

Another object of the invention resides in the provision of means for opening and closing a centrally pivoted sash, whereby the free swinging sash ends are connected in a direct line with the operating means so as to permit a pulling actlon to be exerted in either opening or closing the sash, and thus permit any binding action between the sash and its frame, due to Warping or swelling of the sash or its frame, to be easily overcome.

Nith these and other objects in view, the invention consists of certain novel features of construction as hereinafter described and pointed out in the claim, it being understood that minor changes of construction may be made without departing from the spirit of the invention or sacrificing any of the advantages thereof.

In the drawings, which illustrate a preferred embodiment of my inventionFigure 1 is a sectional view of a window sash and its frame taken on the line a"00 of Fig. 2, together with my sash operating device. Fig. 2 is an elevation showing the sash operating device as applied to a number of sash, and Fig. 3 is a View of a differential sheave employed in connection with the operating device.

Referring now more particularly to the accompanying drawings, a window sash 1 is mounted to swing upon pivots which are preferably disposed. centrally of the side rails of the sash, as indicated at 2, which pivot members are attached to the window frame in the usual manner. Mounted upon brackets 4 attached to the window frame and opposite the pivotal points of the sash, is a shaft 5, which may be rotated by means of a chain 6 passing over a sheave 7, or which may be rotated by any other suitable means. Mounted upon said shaft at a point centrally of the window sash, is a differential sheave 8, flexible cords 9 and 10 having connections, as at 11 and 12, with the upper and lower sash rails respectively, said cords passing over the greater and lesser circumferential portions of said sheave, whereby one of the cords will take up and play out faster than the other upon rotation of the sheave, and thus compensate for the variation in the relative distance of the upper and lower sash rails 13 and 14 with respect to the sheave 8 as the sash swings on its pivots, due to the relativelv spaced and fixed locations of said pivots and sheave, as plainly illustrated by the full and dotted lines in Fig. 1.

It is apparent that in order for the cords to relatively wind and unwind from the differential sheave at the proper speed, the circumference of the larger and smaller winding surfaces of the sheave must be in exact proportion, to obviate the difficulty of obtaining such nicety of proportion as well as overcoming the necessity of mounting the sheave in the precise position with relation to the sash pivots, a coil spring is attached between the end of one of the cords and the sash rail, so as to yield or take up and compensate for any variation in the proper relative speed at which the cords must wind or unwind without counteracting each other or permitting slack in the same.

It will be observed from the foregoing description that I thus provide a device by means of which one or more sash mounted on pivots may be opened or closed in unison, and that the device is simple in structure and easily operated. The pull on the sash for either opening or closing the same being centrally of the sash, obviates the binding action which generally occurs between the sash and its frame when the operating means has connection with the sash at one side thereof, the unequal pull causing a torsion of the sash.

Having thus described my invention, what is claimed is The combination with a centrally pivoted sash, of a differential sheave mounted. intermediate the free ends of the sash and in spaced relation therewith, flexible means connecting the upper and lower sash rails with the larger and smaller portions respectively of the sheave and in oppositely wound In testimony whereof I affix my signarelation thereon, whereby variable distances ture, inpresence of two witnesses.

of the upper and lower sash rails in the v *1 movement thereof with relation to the CHESTER PERkINb' sheave will be compensated for by the dif- Witnesses:

ferential portions of the latter, and means OTIS-L. ROMINE, for rotating the sheave. Gnonon OTTSCH.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patentsv Washington, I G. 

